Piston.



PISTON.

APPLICATION'FILED SEPT. 30.1915." I

Patent ed June 6,1916.

I ,Ghoaenteoennr axon, OFQAK PARK, ILLINOIS, assrenon 'IO RICH-TOOL COMPANY, or onroaeo, rumors, A. conronarrou or ILLINOIS;'

. messe Heron.

To 4125 whom it may concern:

Beitknow'n that I, GEORGE R; RICH, a

-.=citizen of the United-States, and a resident of Oak Park, county of (lookrand State of .-llli11ois,-have invented certain new and use-' ful Improvements in Pistons, of which the following is declared to be a full, clear, and

exact description.

This invention relates to pistons for 1nternal combustion engines, and is 111 the nature of an improvement upon the piston which forms the subject matter of an application for Letters Patent filed by H1611! the United States Patent Ofiice'on the 15th day of May :A. D. l915,'and designated by the SerialNo-28256. D The primary'ob eet of the present invention. is to provide a piston (having the usual wrist pin connection with its connecting rod), with an independently expansible head portion, whereby the main objects of my prior invention in pistons may beattained, and whereby certain additional and improved features are made possible.

Other objects are to simplify the construction thereof; to render assemblage of the parts more easy; and to provide a piston (having a wrist pin directly connected to its body) with an independently expansible head portion yieldingly connected to said. wrist pin.

Other objects and advantages will readily appear from thefollowing description.

The invention consists, therefore, in the several novel features of construction, arrangement and combination of parts hereinafter .fully- ;set forth and claimed.

' The invention is clearly illustrated in the accompanying drawing, in which:

Figure lyis a central, vertical section of a simple form of piston embodying the present invention; Fig. 2 is a side elevation of a certain'member for connecting the head with the wrist pin; Fig. 3 is a horizontal section taken on the line 3-3 of Fig. 1; and Fig. 4 is a detail,-vertical section of fragments of the cylindrical piston. wall and head, showing the latter in expanded condition.

Referring to said drawing, the reference numeral, 10, designates a cylindrical wall open at both ends, and, 15, the disk-like piston head, which covers one end of said cylindrical wall, but is of less diameter than the cylindrical wall. As in the piston format ing the subject matter of the prior applica- Specification of Letters latent. .Patenteti J 11119 6, 1916.

. application filed September so, 1915. Serial No. 53,452.

tion referred to, the upper annular edge, 14, p of the cylindrical wall, 10, is beveled dffto form atapered sea't, and said piston head, 15, has atapered or beveled'edge" portion, 16, that seats uponsaid'beveled' edge, 14, of the cylindrical-wall, 10. The-head is held upon its tapered seat by the mechanism which forms the subject of'the present invention, and will be described herebelow.

The cyliimlrical wall,10,' of the piston, is

directly connected to the connectingrod, 26, i

of the engine by a-wrist'pin, '19, said wrist pin being mounted in hollow bosses, .27,

formed on, and projectinginwardly from,

the cylindrical wall, 10. The wrist pin extends through a bearing aperture in the connecting rod, as is customary "in pistons.

For connecting the piston hea'd,'15,, and wrist pin, 19, I employ a yoke shapedcon- .necting member, 13, which has a cross piece,

24, and two downwardly projecting members, 12, that straddle the end of the connecting rod and have alined' apertures, 28,

formed near their lower ends for the recepsleeve, that surrounds the stem, 17, and

bears against a U-shaped washer,21, the legs of which straddle areduced neck portion, 29, of the stem, 17, and seat in the groove around said reduced portion. The coiled compression spring, 25, bears downward against the flange or shoulder of the sleeve, 22, and acts to hold the piston head upon its seat on the cylindrical Wall, 10. Preferably, the U-shaped washer. fits in a recess, 30, formed in the lower face of the sleeve, so 'as to economize space; it is attached to the stem by pressing the sleeve upward against the spring until its lower face is flush with the top of the groove around the neck portion of the stem, and then slipping said U-washer upon said neck portion. When released, the spring forces the sleeve down upon the washer. The sleeve and washer form a shoulder or abutment fixedly connected to the stem, for the spring to bear against and thereby hold the head on' its seat. 1 t Y In use, the head is free to expand radially, and independently of the cylindrical wall, 10, and in expanding said head rides up the tapered-seat, 14, its stem and attached sleeve compressing the spring slightly. lNhile the head cools, it contracts and rides down the tapered seat, the spring expanding slightly during said movement of the head; consequently, the head and cylindrical wall are constantly kept in close contact, thereby pre- 1 claim as new and desire to secure by v Letters Patent:

l; A piston for motors, comprising a hollow piston body having an annular seat on one end, a "wrist pin secured in saidibody,

and adapted for attachment to a connecting rod, an independently expansible piston head of less diameter than said body, seated upon saidannular seat, and connections between said Wrist .pin and head for holding said head on its seat. 2

2. A piston for motors,comprising a hollow piston body, a wrist pin secured directly thereto and adapted for connection with a connecting rod, an independently expansible piston head of less diameter than said piston body, and yielding connections between said wrist pin and head.

3. A piston for motors, comprising a-hollow piston body, a wrist pin secured directly thereto and adapted for connection with a connecting rod, an independent, expansible piston head of less diameter than said piston body, and having a stem projecting into the hollow oiisaid piston body, a connecting member secured to said wrist pin, and :a coiled, compression spring confined un der compression between said connecting messes member and a shoulder carried by said stem. said spring being arranged to hold said head upon its seat.

4. A piston cured directly thereto and adapted for connection with a connecting rod, anindependent, expansible piston head of'less diameter than said piston body, seated upon one end of said piston body and having a stem projecting into the hollow of said is ten body, a yoke shaped, connecting mem er having apertured members forthe reception of said wrist pin, and a coiled compression spring confined under compression between said connecting member and a shoulder on said stem, said spring acting to hold said head on its seat.

5. A piston for motors, comprising a hollow piston body, open at both ends, and having an annular tapered seat on one end, a

wrist pin secured to said piston body and adapted for connection with a connecting rod, an independently expansible, disk-like piston head of less diameter than the piston for motors, comprising a hollow, open ended piston body, a wrist pin sebody, having a tapered edge portion seating on said tapered seat of the piston body, said head having a stem projecting into the hollow of said body a yoke-like connecting member secured upon said wrist pin, a shouldered csleeve secured upon said stem, and a coiled compression spring, confined under compression between said yoke-like connecting member and shoulder of the sleeve, and acting to hold said head upon its seat. i

6. A piston for motors, comprising a cylindrical wall open at both ends, and having a tapered, annular seat on one end, and inscones noisnn'r men. 

